Required Port 443 For Veeam Backup Replication Is Occupied By Another Application Link Jun 2026

Consult the Veeam Ports Guide to ensure no other required ports are blocked.

To check and remove this listener:

: Veeam KB4557 advises that if third-party software is using the port, it is generally better to reconfigure that software rather than trying to modify Veeam's expected configuration. Summary of Resolution Steps

Sometimes, netstat shows that the "System" process is listening on 443, but IIS is not installed. This is often caused by listening on port 443 for HTTPS listeners. Consult the Veeam Ports Guide to ensure no

Port 443 is the standard HTTPS port. Common applications that conflict with Veeam include:

Locate the service mapped to the conflicting executable found during Phase 1.

Port 443 is the standard port for HTTPS (Hypertext Transfer Protocol Secure) traffic. When Veeam Backup & Replication requires this port for its web services or API Gateway, it checks for availability during installation or service startup. If another application is already bound to this port, Veeam cannot claim it, triggering the port conflict error. This is often caused by listening on port

Veeam Backup & Replication (VBR) v13 introduces a strict requirement for , which is used for the new hardcoded REST API and Web UI services . This shift from previous versions can cause critical installation or upgrade failures if another application—such as IIS, VMware Workstation, or Hyper-V Replication—is already listening on that port. Identifying the Conflicting Application

Troubleshooting Veeam: "Port 443 is Required but Occupied by Another Application"

Port 443 is the standard for HTTPS, making it a high-traffic area. Frequent "squatters" include: Hyper-V Replication: By default, Hyper-V uses 443 for its replication traffic. IIS (Internet Information Services): Port 443 is the standard port for HTTPS

Alternatively, you can open , navigate to the Network tab, expand the Listening Ports section, and filter by Port 443 to easily identify the application name. How to Resolve the Port Conflict

Required port 443 for Veeam Backup & Replication is occupied by another application — how to identify and resolve

For Veeam Backup & Replication v13, there is currently "no supported method to change the port for the Veeam Web service/API Gateway".